Method of manufacturing liquid lenses.



UNITED STATES Iva 807,300.

lm u'ovements in and Relating to the Method of Manufacturing Liquid Lenses; ,and I do hereby declare the following to be a full, clear,

and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Hitherto optical lenses filled with liquid have been constructed in the form of flat flasks and filled through the neckof' the flaskand then sealed or fused up or else of two piecesof glass, each formed'so as to correspond to onehnlf of the lens and held together by means of clips and wires,- a filling-aperture being made either d n ring the formation of the parts or after they have been assembled, this open-' ing bcing.sealed up after the lens has. been filled. The employment of a filling-aperture presents the defect that this, aperture or its mouthpiece renders it impossible to retain a perfect lens formation and also that owing to o the sealing an irregular heating of the lenscasing is produced, whereby the lens may be fractured and sufiers in clearness-and uniformity. In addition to this there is the-difficulty of exactly and completely filling the lens through this aperture in such a manner that no air-bubbles remain in the liquid; The employment of clips and wires or other mechanical devices for holding together the two halves of the lens results in further difliculties. well finished, and therefore increase 'the'cost of production, more especially in the case of lenses of large diameter, so that the economy in the cost of production, which is one'of the chief reasons for employing liquid lenses for large sizes, is almost completely nullified. In

addition to this the mechanical devices do not permit of the formation of permanentlyetight lensesif they are ad ustably arranged,- as

owing to their-expans'ibility, which is difier-' ent from that of glass, they are liable to bethe mechanical connections above referred to,

. 't'\ l v PATENT OFFICE. CHARLES MAYERING, OF ZICHYFALVA, AUSTRIA-HUNGARY.

METHOD OF MANUFACTURING-LIQUID LENS E S.

Specification of Letters Patent. Application filed A ril 18, 1903. Borrowed November 18, 1906. Burial Ho 287,188.,

Such devices must be very exactly and Patented Dec. .12, 1905,

and also the' necessity .for heating the filled lens are all obviated; f

The glass bodies'formed so as to correspond to the halves of the lens are in accordance with my invention immersed In the filling liquid,and I while so immersed their edges are arranged i together, whereupon the loosely-assembled lens, which is completely filled with the liq-i uid, is withdrawn therefrom and the assembled edges coated-with a'substance to which the character of glass can be imparted in acold condition. Thickened soluble glassis the most suitable substance for this'pur'pose suitable quantity of this substance is'spread' E over the edge of the lens, and after it is dry it is converted into glass by the repeated application of dilute hydrochloric acid. In this manner a most finely and tightly closed liquid f i lens isobtained which, owing to'the method '75: ;I

of this manufacture, is free from all the do fects enumerated above. In carrying out this method'of manufacture in practice it is; adi vantageous to make use of two brushes mount- 1 ed upon one and the same handle, one of these j brushes being kept dry and the other im- I mersed in the water-glass. The edge of the lens lifted from the fillingliquid is submitted 7 to the section of these two brushes, the dry brush serving to wipe off the 'liquid, while the 5 otlaher brush simultaneously applies the watery g ass. i

Lenses produced in accordance with this 5 invention secure also the advantages obtain- .able from-liquid lenses whenthe defects men- 9 tioned above andwhich this invention is intended to obviate have been eliminated,'and

"by suitably selecting or composing the filling liquidacromatic' lenses of dimensions hitherto v V, unattainable may be prod uced'which arequite equal to ground solid lenses and which'areen-- tirely free from cords and air-bubbles and with which the mostvarious focal distances maybe inexpensively and simply produced.

lclaim' 1306 1., The method of "manufacturing lenses which consists in immersing suitably-shaped -hollow,lens-halves into the liquid tobe used for filling the lens, uniting the said lens halves' while under thesurface of the said liquid so I' F as to form an entire lens, removing the said entire lens from the liquid, and sealing the edges of said entire lens by means of a suitable. cementing substance. I. 1 2. The, method f manufacturing, lenses r fe which consists in-iinmersing suitably-shaped i j hollow lens-halves intothe liquid to bausadi it me a SUBSTlTUTED FOR ivllSSiliG COPY SEARCH ROOM for filling the lens, uniting the said lens-halves In testimony that I claim the foregoing as while under the surface of the said liquid so I my invention I have signedmy name in pres-' I0 as to form'an entire lens, removing the said of said entire lens'by means of water-glass, v drying the said sealing means, and treating Witnesses:

ence oftwo subscribing witnesses.

entire lens from the liquidg sealing the edges H R MYAYERING- "it with hydrochlorie apid so astoha rden' the J nLEs KORMOs,-

same. JOHN GERZUTZO. 

